View single post by sparks
 Posted: Nov 7th, 2011 02:52 PM
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sparks



Joined: Jan 15th, 2008
Location: New Zealand
Posts: 77
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Use of the ferrite rod may not be a good idea due to its high Q and sensitivity. Id suggest an RF choke of equivalent or higher inductance value, so the Q and radio pickup ability is much lower.  Also put a resistor across the choke to lower the Q further. Try 10K to start and then lower values to get the Q down.
The idea is to receive atmospheric noise without receiving radio stations, so if you want to make it resonant, it needs to be in a band that is not used for radio broadcasting. A spot frequency in an unused band, say longwave would be the ideal.
JEFF